/**
 * 
 */

 let arr=[],a={ti:123,ff:34}
 arr.push(a)
 a.ff=-1

 console.log(arr)

 arr=[1,2,3,5,6,7,5,3]

 console.log(arr.filter((it,i)=>{if(it===5)return i}))


 const aa={a:1,b:43}
 let b=new Proxy(aa,{
   set(target,key,val,receiver){
     console.log('set',key)
    return Reflect.set(target,key,val,receiver)
   },
   get(target,key,receiver){
     console.log('get',key)
    return Reflect.set(target,key,receiver)
   }
 })

 console.log(aa,b)

